Really? This surprises me. I've used them for projects and for my home-manager setup and it's always been amazing at it. The best example I can come up with is packaging a font I needed into a nix package for a LaTeX file. It would have taken me a month of trying various smaller projects to know how to do that.
Honestly it helped quite a bit. There are a lot of obscure (imo) errors in Nix that LLMs spot pretty quickly. I made quite a bit of progress since using them for this.
